The word "cactus" comes from the Greek. κακτος (bristle), which in Classical Greek was used to denote plants with thistles like thistles. And only in 1737 Karl Linnaeus introduced this word as the name of the genus Cactus.
The fruits of some species of cacti are eaten, they are collectively known as pitahaya, or dragon fruit.
In total, botanists have about 3000 species of cacti.
Europeans were the first to collect cacti because of their exotic appearance. The first known collection of cacti was collected in the second half of the 16th century. by the pharmacist Morgan in London.
In Mexico, instead of a Christmas tree, a cactus is used as a symbolic New Year tree.
A special type of cactus called blue agave is used in tequila production.
The roots of the Mexican peyote cactus (Lophophora williamsii) are used by shamans to go into trance because of their hallucinogenic properties.
There is a lot of moisture in the cactus, many travelers in the desert were saved from thirst only thanks to the cacti from which they extracted water.
Cacti tolerate heat well, for them a temperature of 60 degrees is considered quite comfortable.
Cactus spines serve as an air ionizer, this is a proven fact.
Giant Cereus (Cereus giganteus) is the largest cactus in the world, its height can reach 15-25 meters, and its weight is up to 10 tons.
The smallest cacti in the world are called blossfeldia - they fit in a teaspoon.
The Australians suffered the most from cacti, they were brought there by settlers from Brazil. And they almost destroyed all the livestock (the cows ate and died from needles). They escaped adversity by spraying a cactus pest from an airplane - the Argentinean moth. For this she (moth) in Australia even erected a monument.
Carmine (food supplement E120) is made from female cactus insect insects.